Wisconsinfag here, I know this feel to a T, but this year we kinda abused it, we had one of the coldest winters on record in over 100 years, we started wearing t-shirts and shorts when it got to 40*F or 4.4*C.

well here in Canada, it get to negative -30 so when in spring 15 degrees is pretty hot compared to -30, and in the summer it is the opposite, we get plus 30 with humid-ex(humidity in the air) therefore 15 is pretty cold. and our bodies adapted to the previous temperatures of that season,